[NLRS] Where to go instead of 3456...

[John Kalenowsky]

Jon's "..73" got appended to the end of the URL he posted for the SBMS
document. Instead, try:

https://www.w6ife.com/documents/3.4%20GHz/SBMS%203_4%20GHz%202021_04_02.pdf

I recall seeing a posting by someone who said they had chosen 3255 as their
LO so 3400 would be 145 on their IF radio. They would not be able to get to
3398.1 unless their IF transmitter would transmit on 143.1. But that may
just be one person's choice and not a problem if they are only interested
in EME.

Is there any reason to go to 3398.1 as opposed to 3399.1 for the
terrestrial weak signal calling frequency? Would a 1 MHz separation between
terrestrial weak signal work and EME be enough? Or is there a reason that
it needs to be 2 MHz? Typical antennas are so directional for the 9cm band
that it's hard to imagine any sort of interference.

Has anyone looked at the possibility of crystal availability that might
conveniently multiply to the needed LO frequency?
An LO of 3254.0 would yield - 144.1 = 3398.1, 145.1 = 3399.1 and 146.1 =
3400.1

Whether 3254 or 3255 for LO, I don't see any divisors that get to what
might be an even MHz (or .5 MHz) as there is for the 3312 MHz used for
144.1 = 3456.1 (92.0 MHz * 36 = 3312 MHz).

For now, I guess we're STILL able to use 3456.1, so *some* time to figure
it all out.

73, JK


On Wed, Apr 7, 2021 at 9:55 AM Jon Platt via NLRS <nlrs at mailman.qth.net>
wrote:

> Hello NLRS land.  There is ongoing information and discussions regarding
> the future of our 9cm band.  It appears that the original doom and gloom
> prediction of loosing the entire band to amateur radio use has changed
> (good news) and that we will be maintaining a chunk of that spectrum at
> 3.30 to 3.45 GHz.   This does mean that many of us with legacy equipment
> will have to re-align them (if possible) from the current calling frequency
> of 3456.100 MHz.   There is ongoing discussion about what may be the best
> terrestrial based weak signal calling frequency, either 3398.100 or
> 3400.100 MHz.  The SBMS has posted their thoughts on this subject at
> https://w6ife.com/documents/3.4%20GHz/SBMS%203_4%20GHz%202021_04_02.pdf..73,
> JonW0ZQ
>
>